Hunet Display Technology Inc.

Other

Matsushita Electric Industrial Co., Ltd.

Yutaka Ozaki

Ozaki, Yutaka

Kenji Nakamura

Driving voltages of an LED of each color are stored in applied voltage storage registeror, and the LED of each color is driven with independent driving voltage, whereby current consumption is reduced. Further, data in applied voltage storage registersandis made rewritable via storage value setting bus, and when there are fluctuations in minimum emission voltage in actually mounted LEDs due to individual differences, voltages to store in the applied voltage storage registersandcan be changed as appropriate corresponding to the fluctuations.

LED driving device for multiple color LED displays

A voltage with a predetermined pattern is applied to liquid crystals to drive the liquid crystals during a unit drive period of the liquid crystals and an application pattern according to the gradation data is set taking into account a value obtained by integrating the amount of transmitted light of liquid crystals at various points in time when each application pattern is applied to the liquid crystals. This allows a fine gradation display even if the liquid crystals are driven by only ON/OFF of a maximum rated voltage. As a result, it is possible to drive the liquid crystals at high speed and produce a multi-gradation display.

Liquid crystal drive apparatus and gradation display method

To rotate a multivalued source picture image consisting of picture data arranged in N rows.times.(m gradations*N) columns 90 degrees, calculating a maximum value of a transposition mode L according to an equation M=[log.sub.2 N], repeatedly selecting an A-th row by increasing a row number A in increments of 1 in the range k*2.sup.L .ltoreq.A.ltoreq.k*2.sup.L +2.sup.L-1 -1 in an inner loop and increasing a value k in increments of 1 in the range 0.ltoreq.k.ltoreq.N/2.sup.L -1 in a middle loop while increasing the transposition mode L in increments of 1 in the range of 1 to M in an outer loop, selecting a B-th row according to an equation B=A+2.sup.L-1 each time the A-th row is selected, transposing the picture data A(j) arranged at j-th columns of the A-th row to A'(j) and the picture data. A(j+m*2.sup.L-1) to B'(j) arranged at the B-th row in the range p*m*2.sup.L .ltoreq.j.ltoreq.p*m*2.sup.L +m*2.sup.L-1 -1 and 0.ltoreq.p.ltoreq.N/2.sup.L -1, transposing the picture data B(j) arranged at j-th columns of the B-th row to B'(j) and the picture data B(j-m*2.sup.L-1) to A'(j) in the range p*m*2.sup.L +m*2.sup.L-1 .ltoreq.j.ltoreq.p*m*2.sup.L +m*2.sup.L -1 to form a quasi-transposed picture image, and changing picture data E(i,m*(N-j-1)+q) of the quasi-transposed picture image to F(m*j+q) in the range 0.ltoreq.j.ltoreq.N-1 and 0.ltoreq.q.ltoreq.m-1 to form a destination picture image.

Growing community of inventors

Tsuchiura, Japan

Yutaka Ozaki